*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #2196f3;
}
.container{
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}
.container span{
    width: 50px;
    height: 300px;
    margin: 0 20px;
    background: #2196f3;
    animation: animate 1.4s linear infinite;
}
.container span:nth-child(1){
    animation-delay: 0s;
}
.container span:nth-child(2){
    animation-delay: 0.2s;
}
.container span:nth-child(3){
    animation-delay: 0.4s;
}
.container span:nth-child(4){
    animation-delay: 0.6s;
}
.container span:nth-child(5){
    animation-delay: 0.8s;
}
.container span:nth-child(6){
    animation-delay: 1s;
}
.container span:nth-child(7){
    animation-delay: 1.2s;
}
@keyframes animate {
    0%{
        box-shadow: 0 0 0 rgba(0, 0, 0, .5);
        opacity: 0;
        transform: translateX(-50px)scale(1);
    }
    50%{
        box-shadow: 0 20px 50px rgba(0, 0, 0, .5);
        transform: translateX(0px)scale(1);
        opacity: 1;
    }
    100%{
        box-shadow: 0 0 0 rgba(0, 0, 0, .5);
        transform: translateX(50px)scale(1);
        opacity: 0;
    }
}

